一维跳棋【计蒜客】

#include
#include
#include
#include
#include
#include
using namespace std;
int N;
unordered_map<string,bool>mp;
struct node{
    string status;
    int pos=-1;
    vector<int>step;
};
string _swap(string s,int a,int b)
{
    string temp=s;
    char t=s[a];
    temp[a]=s[b];
    temp[b]=t;
    return temp;
}
int main()
{
    cin>>N;
    string st,se;
    for(int i=0;i<N;i++)
    {
        st=st+'1';
        se=se+'2';
    }
    st=st+'0';
    se=se+'0';
    for(int i=0;i<N;i++)
    {
        st=st+'2';
        se=se+'1';
    }
    //cout<
    node start_node;
    start_node.status=st;
    start_node.pos=N;
    start_node.step.push_back(N);;
    queue<node>q;
    q.push(start_node);
    int dix[4]={-2,-1,1,2};
    while(q.size())
    {
        node t=q.front();
        q.pop();

        if(t.status == se)
        {
            int cnt=0;
            for(int i=1;i<t.step.size();i++)
            {
                if(cnt==4)
                {
                    cout<<t.step[i]+1<<endl;
                    cnt=0;
                }
                else{
                    cout<<t.step[i]+1<<' ';
                    cnt++;
                }
            }
            return 0;
        }
        for(int i=0;i<4;i++)
        {
            int next_tpos0=t.pos+dix[i];
            if(next_tpos0>=0 && next_tpos0<N*2+1)
            {
                string next_status=_swap(t.status,t.pos,next_tpos0);
                if(!mp[next_status])
                {
                    mp[next_status]=1;
                    node next_node;
                    next_node.status=next_status;
                    next_node.pos=next_tpos0;
                    next_node.step=t.step;
                    next_node.step.push_back(next_tpos0);
                    q.push(next_node);
                }
            }
        }

    }
}